基于坡印廷矢量的地震照明分析  

Seismic illumination analysis based on the Poynting vector

作　　者：庞新明[1,2] 赵明辉[1] 张敏[3] 杨国权[3] PANG Xinming;ZHAO Minghui;ZHANG Min;YANG Guoquan(CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China;School of Geosciences of China University of Petroleum (East China), Qingdao 266580, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院边缘海与大洋地质重点实验室(南海海洋研究所),广东广州510301 [2]中国科学院大学,北京100049 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《热带海洋学报》2017年第3期86-93,共8页Journal of Tropical Oceanography

基　　金：国家基金项目(91428204;41376063;41176053)~~

摘　　要：基于坡印廷矢量分解波场、高斯加权去噪,以及在三维模型定向照明中的测试研究,可以促进基于坡印廷矢量地震照明方法的推广应用。在目标区通过反向照明分析得到了采集参数最优范围;根据坡印廷矢量定向分解波场,统计不同照明角度对应的能量分布情况,得到最优照明角度范围;并通过高斯加权去噪,提高了波场分解的分辨率与保真度,证明了这种方法的有效性。该方法相比较于传统的射线追踪照明避免了高频近似,相较于单程波照明波场信息更加全面,相较于频率域的波场角度分解计算更加简单高效,加入加权去噪后,角度分解的波场信息信噪比和保真度均有提高。在三维模型中,该方法实现了倾角照明和方位角照明。试算结果不仅为复杂的二维地质模型中地震采集设计提供了科学依据,同时为今后在三维模型中采集参数优化提供了实践经验,拓展了坡印廷矢量的应用范围。Research on seismic wave field decomposition and Gaussian de-noising and directional illumination in threedimensional(3D)models will promote a wide application of seismic illumination based on the Poynting vector.In this paper,optimal angle illumination is found through obtaining the acquisition parameter by laying source in the target area,namelyreversed illumination,then decomposing the wave field transmitting from best source position based on the Poynting vector,and using statistics on the energy of different angles.In addition,the de-noised wave filed obtained by Gaussian filter improvesthe stability and fidelity of wave field decomposition,which demonstrates the effectiveness of the method.Compared to thetraditional ray-tracing illumination,illumination based on double way wave equation avoids high frequency approximation,whose information of wave field is more comprehensive compared with one-way wave equation and whose calculation is moreefficient.With weighted de-noising,the fidelity and signal-to-noise ratio of the wave field are improved.Moreover,themethod is developed in the3D model to realize dip illumination and azimuth illumination.These results not only providescientific basis for seismic observation system of complex2D geological model,but also offer a base for future applications inoptimization of3D acquisition parameters,which is advantageous to promote applied domain of the Poynting vector.

关 键 词：地震照明 坡印廷矢量 高斯加权法 定向分解 

分 类 号：P714.83[天文地球—海洋科学]